I am bothered on how the area of circular sector was derived using integration. I have a solution but I don't know how it will go and come up with the formula:(adsbygoogle = window.adsbygoogle || []).push({});

A = 1/2 sr and A = 1/2 r^{2}θ

Can someone show me the solution for the derivation of the two formula?

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# I Area of sector by integration

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